domain mapping error problem

Hi I had installed the multisite about two weeks ago as well as the domain mapping plugin. Everything was fine I was able to give each site a unique domain name. Today I installed a bunch of plugins at WPMUDEV and then I noticed that all the unique domain were taking me to the main one. So I decided to uninstall multi-domains and reinstall and I'm getting this error when I go to domain mapping in tools

Please edit your /home4/p8k9u3s4/public_html/wp-config.php and move the line define( 'SUNRISE', 'on' ); above the last require_once() in that file or make sure you updated sunrise.php.

If anyone can help I would greatly appreciate it. Thanks.